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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2d9e6ca5e04057a686c80d635fe96a7743988056df58a283d4f9c7e840b006' 
  AND token = '5On3LYAPPEFeqGe3b1SoPz1qYG3L5EmcohgR16dxP3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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