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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a37a0f630b7fdf924abfb326d10c52ee3820069bc8dc9fce7d8ab93d80ed1ab' 
  AND token = 'li69Co+lIcH8a2qbTBp6sYtNTV/Bclt4eyjBo1Og8B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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