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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b2a97f4c57d3dd15b963d598533b9b5aaa6bff1b4e701880968e502087356c' 
  AND token = 'O7QH/SpO0XyrxvOLQ5x9GTvtnlApxOQbwlvLIOqQQW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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