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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d25a1245ee6eb3fac82529d756f6c1597f84846d5d5dddee51f1c619cf69e6' 
  AND token = 'tlfe4k3b68+9JES7l6+glHzZB+f/71mF7OyDGcbw4gc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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