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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c173fb0969cbf8f4723342de37fa18ed3f762b3856e6d8e17bfd7d6267a9d777' 
  AND token = 'FQb8aPEOmFrlvmiOHlvoDeCh0jXx2J6ZQR44ORJJk6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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