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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '125dd7c0323f51e4bafca86996b270ac77e9e337de2da32a450298e12d77c62f' 
  AND token = 't7OfS442fWmHM6t4zENY/04SNZYlOw5uj1tGHCC8VFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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