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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15faf0d268eb1cf7aa953e084ba63d5133c0f10e8a413d25ac161111045ebd99' 
  AND token = 'IOrQ6fxoL4z2luRlXAwSyjCOoRwE8UkR6ilk2toq75o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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