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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81ed565856bc5c7ab26ac79def0417c4fce8d4a8dee6a8e6733c4053e9218c30' 
  AND token = '/ODnKoT26xWhwZBUbYF16MpDTE2fb6XcRHbfqhpnkcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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