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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7019c95a58d140f280943819ce6d9bb2ca32785e91a108a10f0cdfdb5fde55fe' 
  AND token = 'TcZcCR/93kMjs+WYRGNrUpBQhY5wiMHW6ejcL8u2RT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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