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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84cb2f70dd475a947a48854a1e205cc23392031f3d52901d997551f17e5baeb' 
  AND token = 'Cctijor2F/Y7qDczu/qOqDgCnTG1794qDNGm2I+D1gg=' 
  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"
    }
  }
}