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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ca8d789b7ac8c79f98b9e8cd39cccbdabfc22c3a55e669f4dac91fc68f57e28' 
  AND token = '7CPh1kdwXX+SdzQVXGyfP7WWmbxjzsehFrI2X9X706Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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