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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a49c9b14387dece93620e0e0b697d92efcdc0e9c63f550546a7ba3ff7b85a6' 
  AND token = 'og1kqJmqKGOeq0g1HII3wPcXP3T2Ka+0o73yCb0f3wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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