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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47baa1a6ccd0d0abeb08b979b211bd715249c2ac28e6ed4634f0100da0c9e47a' 
  AND token = 'on49FXwznFOT8I1jdxtzfBXNEoZytrPoDGEhs2HPivw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}