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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5cf92c0faa0708ad9a61940866777deba7a10925b44952a185cc83557e6981' 
  AND token = '79wXKDcnrbP/qpGlQAppNsx35dFclf50dilZ02VQ7oU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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