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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afd32f009ec726ea5236055c3be6e174a53965cc9e91db4638ed90e7d3b16820' 
  AND token = 'HBvMDYmBL1S7Zq/zdtiFBgwHdo1k4w69OKA6065pYk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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