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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2491b772b32317a56e70b12ea5684c727b3a196b71db2fbb2ff9e08c563a565' 
  AND token = 'GtC1hZuwFIQgfsafc0uvWuuYcPasshK+ltSmyMtPr8g=' 
  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"
    }
  }
}