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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ee901fae31ab789026563e878f61b74bb2bd180ceb699e4c731dda2b0921ae' 
  AND token = 'nYC9fLOILS1yOlAH4EO6tOnyeMnmE4jFzs5YPo9ktx8=' 
  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"
    }
  }
}