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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd037c6ca876eaa3d03e1a8b93384e00bea7e5e48f4c82f1e02c273719af4f6' 
  AND token = '93o3pb3hV6Fm6Zmhu91NGT+Buu15dK4IVU9rtTe84z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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