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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bca4200e23c11991f794791284fefceb69fac465084cc8c006121fcfc6dfb853' 
  AND token = 'IA+RTFUZ5WHLZ83E0HrX+YLq88DuXz04ohHf6PBwWn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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