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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13aeff89947bc8de0f26fda6908cc72c8d3e6e7f3c3882c16040dc3a11f6f998' 
  AND token = 'lpQffYXc5R/9oW8Ie2mOxc9lu5hv65sw45XqiJiBBLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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