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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3beab5aaf58aa0c30c58a5eaaa658e6bf00956cfd2f793b2ebef9d7bc070d032' 
  AND token = '4IjjvrXDDWI932Moo1Y0zKYcvBqkRqFq1h92B5dgImc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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