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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8854334e1cd51fb47c17a8ba1f87d620171189ca93b46eb05afa323b8d2da6cc' 
  AND token = 'vCVoI0WZ5fLOykM5aCwUHIvr5ohmCpRT/Q7FPNPQ9Rk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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