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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c85d11d6f2d5fc14e7e3765da9d4cf30783a79c78bc1ad5165760c971b678789' 
  AND token = 'kKU0QZCdNW6NTDy9ho0Kk8iFRdyDdq4DP7maFqt/rIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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