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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfb0bb6118b53b9c633f1ccab7132fc623eab2edd1364238f526de74539fef1c' 
  AND token = '2KXFMCgNSooY15PtYJsMiijMo2Trh1/10RuD09gQP0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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