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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ece222b2930b6b2f14cf51ffb7304058e381a9a4a5f896ec5fd3a98b6892890' 
  AND token = 'ZMWVmMZFXubn94yMqMoor+6oNV/xpDmuaDBqHVBF2/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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