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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b83fd572f96abffc69252744591f6c11333bec5cbd0dc458682cf96a575ca037' 
  AND token = 'W4IwN5k7llvS86TWUKrh3mT7tbRiSM2nlVXC+FWddEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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