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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31767ff053f6d778679cd14c8d4e1a5a7637275208e02737dc3a4e4a54cc8b7c' 
  AND token = 'H/81eQmI+bmKo1Gkjg6dHe6MPnRABiangzNfJ3t0tJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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