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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f0bc94c9363563b3af87eb48f427d7eee38b0f2e8369dd3ccd6cf4eb8b1ce4' 
  AND token = 'WAL/9df8GkQR4WuowuGNmVW1Q8RK05crVxrxf1EPTkY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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