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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a17daa1db348e6144d0ce061412112dedbabf37ed5c89ab4c3e7f50528925e' 
  AND token = 'svP7ubQVgKAf0+edrTxGD/NJbb+qdjtdJO2gTn+8vHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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