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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed6512f34f2bb71cc4c2b281d4e78c979d3233ee11c166aea2d8738ede7bd3c' 
  AND token = 'IoynEPLve1Wqo0/CbKg3DWSTWoF76/hZ9vFxSB9kR1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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