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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd792d60ba0f14d77e33080f0f9ca4fd4f4e5d3dd2c50c665ac8a94896ed5139e' 
  AND token = 'seV2lpVrauVvkvz+6U4vfX7i+v5dlXZ8/YH1D79Zvhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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