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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328ec927e4a3e4f0f1932c3413a01d4615fb0e5c656bb0b88e027678753013c8' 
  AND token = 'WrjeIyHbNt1x2wQql0pUzT1qy0xmbvSr3cBEm5nrUYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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