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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae9a0afdf67b384e5d3929610433166ec65969ee7c3039cdf73652df33dfee4e' 
  AND token = 'e0h2L1DOnzGk/RKKwREJvi1aOJos5s7F7JF9yV3P0Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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