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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e98c9abc049b2b3e15c77c19d9612b4a1e2c804913e808339ffc1fd6c88e3b65' 
  AND token = 'ThG4CsPnNMj+AC3On5uqGTryA2gnc/zQCzgTTM4JciM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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