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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23d2d0b084dc5648bc870a474c01efbe03d2a96cbcb4477513844d83001c67a' 
  AND token = 'eRX5z3D4tFyzUzRITx/cyxvLJ8ZCz/AObXGtOilQNOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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