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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aca84fe8ed47fd1fb14f4c239f5f8fc93110c4e96259aa939f65e4a5eff2661b' 
  AND token = 'FvXhwG5XZ2j1i5RWiirbua4BlEeIkfa/VNIy8+udL/M=' 
  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"
    }
  }
}