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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44d2558bac3ba9d0f026e57f73ab89e504720271872e8756af778aeab681804' 
  AND token = 'hObDLM0h6KSn2XJk8cI3FNr4fnwGoO31Ij3UKlkQ8hQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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