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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33fbbc01ee252e48dda8e6890327c408dceb4329469f4ad3435bbdfcd5dc4e58' 
  AND token = '3KD7OPqSa7QG2NU18al9SRSQkDJDUd/LldTRC9pu/lc=' 
  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"
    }
  }
}