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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1543f54ce7de3a6db47b52b2407006176342ba752f68bbb4b730082ab715eb' 
  AND token = 's4qla7J7q8LOUJrgP0ttUzV371SEcVddaJWEvSix7HQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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