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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b67b2347efd31ad48f4a29b8432b998ad106fb22851763db631e108375a713' 
  AND token = 'uLYQg83opWGAksT+ZbU5VWdX5Cp2+DM1u/oO/P5CRdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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