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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a07e7287e02f2596b740647e430aaea1675f2cccf20a7f028558d3b70dc3d9' 
  AND token = 'ruC623vKX1qYTHzAp6kET80+67VvIwIeGHTfbJ7qDgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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