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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8016b8a59b3447637c63aa47ed43ca3974adc78831e41f746964e889149689f0' 
  AND token = 'YuA4Wb35ygHj4yu6hUZt7uEJAB03bQE6xmeg+6NsB+A=' 
  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"
    }
  }
}