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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807dad1e197fbcfc10e191485232b1f60a6ec3068e485e6ae0ddf7e81dac1514' 
  AND token = '0gu7LmYUCHz+PSrcP3EyRK6/O9IXCUrXq4tW/aceqHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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